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LM7818CT

3-Terminal 1 A Positive Voltage Regulator

Fairchild Semiconductor 

Electrical Characteristics (LM7809) (Continued)

Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 15V, CI = 0.33µF, CO = 0.1µF, unless otherwise specified.

Symbol

Parameter

Conditions

Min. Typ. Max. Unit

VO Output Voltage

TJ = +25°C

8.65

9.0

9.35

V

Regline Line Regulation(7)

5mA ≤ IO ≤ 1A, PO ≤ 15W,

VI = 11.5V to 24V

TJ = +25°C VI = 11.5V to 25V

8.6

9.0

9.4

–

6.0

180

mV

Regload Load Regulation(7)

VI = 12V to 17V

TJ = +25°C IO = 5mA to 1.5A

–

2.0

90.0

–

12.0

180

mV

IO = 250mA to 750mA

–

4.0

90.0

IQ Quiescent Current

TJ = +25°C

–

5.0

8.0

mA

∆IQ Quiescent Current Change IO = 5mA to 1A

–

–

0.5

mA

∆VO/∆T Output Voltage Drift(8)

VI = 11.5V to 26V

IO = 5mA

–

–

1.3

–

-1.0

–

mV/°C

VN Output Noise Voltage

RR Ripple Rejection(8)

f = 10Hz to 100kHz, TA = +25°C

f = 120Hz, VO = 13V to 23V

–

58.0

56.0

71.0

–

µV/VO

–

dB

VDROP Dropout Voltage

rO

Output Resistance(8)

IO = 1A, TJ = +25°C

f = 1kHz

–

2.0

–

V

–

17.0

–

mΩ

ISC Short Circuit Current

IPK

Peak Current(8)

VI = 35V, TA = +25°C

TJ = +25°C

–

250

–

mA

–

2.2

–

A

Notes:

7. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must

be taken into account separately. Pulse testing with low duty is used.

8. These parameters, although guaranteed, are not 100% tested in production.

6

LM78XX/LM78XXA Rev. 1.0

www.fairchildsemi.com

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